Synthesis and structure of environmentally relevant perfluorinated sulfonamides
作者:Hans-Joachim Lehmler、V.V.V.N.S. Rama Rao、Dhananjaya Nauduri、John D. Vargo、Sean Parkin
DOI:10.1016/j.jfluchem.2007.01.013
日期:2007.6
perfluorooctanesulfonyl fluoride via the azide by reduction with Zn/HCl. All perfluorooctanesulfonamides contained linear as well as branched C(8)F(17) isomers, typically in a 20:1 to 30:1 ratio. The crystal structures of N-ethyl and N,N-diethyl perfluorooctanesulfonamide show that the S-N bond has considerable double bond character. This double bond character results in a significant rotational barrier around
Sulfonamides have been prepared in high yields by the reactions of N-silylamines with sulfonyl chlorides and fluorides. In a competition experiment, the sulfonyl chlorides were found to be far more reactive than sulfonyl fluorides. The chemistry may be used to prepare aliphatic, aromatic, tertiary, secondary, and primary sulfonamides. It may also be done in the absence of solvent and the byproduct trimethylsilyl chloride recovered in good yield. Primary sulfonamides were synthesized from the sulfonyl chloride with aminotriphenyl silane (Ph3SiNH2), a conversion demonstrated with the synthesis of the carbonic anhydrase inhibitor, acetazolamide. (C) 2013 Elsevier Ltd. All rights reserved.